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Added possibility to check whether it was the WDT interrupt which wok… #64

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Added possibility to check whether it was the WDT interrupt which wok… #64

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23 changes: 22 additions & 1 deletion LowPower.cpp
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
/*******************************************************************************
* LowPower Library
* Version: 1.60
* Version: 1.70
* Date: 01-04-2016
* Author: Lim Phang Moh
* Company: Rocket Scream Electronics
Expand All @@ -13,6 +13,8 @@
*
* Revision Description
* ======== ===========
* 1.70 Added possibility to check whether it was the WDT interrupt which
* woke the MCU. Contributed by Sysshad.
* 1.60 Added support for ATmega256RFR2. Contributed by Rodmg.
* 1.50 Fixed compiler optimization (Arduino IDE 1.6.x branch) on BOD enable
* function that causes the function to be over optimized.
Expand Down Expand Up @@ -1119,6 +1121,22 @@ void LowPowerClass::powerExtStandby(period_t period, adc_t adc, bod_t bod,
#endif
}

/*******************************************************************************
* Function to call to know if it was the WDT interrupt that woke the MCU
* Good if you have multiple wakeup sources like BOD, IO INT, etc... and
* wants to know which one occured.
* Note: Clears the event (sets it to false) so next call will return false
* unless another WDT event occured meanwhile.
*******************************************************************************/
bool LowPowerClass::getWDTEventStatus()
{
bool ret = LowPower._wdtEvent;

LowPower._wdtEvent = false;

return ret;
}

/*******************************************************************************
* Name: ISR (WDT_vect)
* Description: Watchdog Timer interrupt service routine. This routine is
Expand All @@ -1130,6 +1148,9 @@ ISR (WDT_vect)
{
// WDIE & WDIF is cleared in hardware upon entering this ISR
wdt_disable();

// Inform that an WDT event occured!
LowPower._wdtEvent = true;
}

#elif defined (__arm__)
Expand Down
6 changes: 4 additions & 2 deletions LowPower.h
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Original file line number Diff line number Diff line change
Expand Up @@ -119,7 +119,8 @@ class LowPowerClass
{
public:
#if defined (__AVR__)

volatile bool _wdtEvent = false;

#if defined (__AVR_ATmega328P__) || defined (__AVR_ATmega168__)
void idle(period_t period, adc_t adc, timer2_t timer2,
timer1_t timer1, timer0_t timer0, spi_t spi,
Expand Down Expand Up @@ -152,7 +153,8 @@ class LowPowerClass
void powerSave(period_t period, adc_t adc, bod_t bod, timer2_t timer2) __attribute__((optimize("-O1")));
void powerStandby(period_t period, adc_t adc, bod_t bod) __attribute__((optimize("-O1")));
void powerExtStandby(period_t period, adc_t adc, bod_t bod, timer2_t timer2) __attribute__((optimize("-O1")));

bool getWDTEventStatus();

#elif defined (__arm__)

#if defined (__SAMD21G18A__)
Expand Down